CVE-2026-77412 RabbitMQ amqp091-go: Denial of Service via Malicious Field Length in AMQP Client
A malicious AMQP broker can cause a client panic and process termination by sending a crafted field length, requiring an upgrade to the Go client library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77412?
CVE-2026-77412 is a high-severity denial of service vulnerability in rabbitmq amqp091-go, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, readField in read.go reads the length of an AMQP byte-array field with type tag x into a signed int32 and passes the value directly to make when allocating the field buffer. A malicious or compromised broker can encode a value such as 0xFFFFFFFF, which becomes -1 and causes a len out of range runtime panic. The panic escapes the network reader goroutine and terminates the client process, including during connection.start server properties or message header table parsing. This issue is fixed in version 1.13.0.
Weakness: CWE-681
Which versions are affected by CVE-2026-77412?
3 open source packages ship an affected version, including github.com/rabbitmq/amqp091-go.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
github.com/rabbitmq/amqp091-go Go | All versions | 1.13.0 |
How do I fix CVE-2026-77412?
Upgrade github.com/rabbitmq/amqp091-go to 1.13.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-77412 being exploited?
There is no known exploitation of CVE-2026-77412 in the wild and no public exploit code.
Sources
Also known as AZL-103203, AZL-103293, CLEANSTART-2026-FS32533, CLEANSTART-2026-JY06223, CLEANSTART-2026-PK85962, DEBIAN-CVE-2026-77412 and 41 more.